Finding the Third Proportional to 217,628 and 478,024

Step by Step Solution

1. Step 1: Write the proportion equation
   217,628 : 478,024 = 478,024 : x
2. Step 2: Convert to fraction form
   217,628/478,024 = 478,024/x
3. Step 3: Cross multiply
   217,628x = 478,024 × 478,024
4. Step 4: Simplify right side
   217,628x = 228,506,944,576
5. Step 5: Solve for x
   x = 228,506,944,576/217,628
6. Step 6: Final answer
   x = 1,049,988.72